Brake



United states Patent of BRAKE vJohn AC.Hatlieldv,Lake Orion, Michwassignor to Chrysler Corporation, HAHighland Park, Mich., a corporation .of Delaware Application January .16, 1.953,enamorarme V6 claims.- (cl. iss-v3) Thisiinvention relates ato :improvements in` brakes and more Aparticularly .to va :brakeof the vtype for the road Wheel yof a motor vehicle although `the invention in'its zbroad aspects .is not 'limited .-thereto.

:The main object .-of the invention is to improve the operation Iof la .brake by removing therefrom kdust .and particles vwhich are. eroded s-fromethe engaged friction sur- :faces asan incident to brake operation or which other :wise .gain access to gthe brake, andan object of the iinvention-.includes .preventing the.collection of dust and iparticles, regardlessfofor'igin, in a manner to ,adversely .raifectitheeflcient ,anduniform operation of the brake.

.Aifurther object.-of ythe.invent`ion is to` effect removal fof dustrand-sparticlesfrmzgalbrake without resort to rela- .,tively expensive mechanism ofthe type to direct airy cur- ',rents sto '-.the interior .of-.1an enclosed :brake for evacuating dUStand fparticlesxtherefrom. .iInstead, vthe invention provLvidesa simple .and ,inexpensive'but.efcientscraper or :duster whichgcan be;-po'si`ticned entirely withina wheel .-'brake Lhousing 'to lbe .braked and which .will direct =dust and particles to suitableoutlets"in.such:housing for .discharge therefrom. v

By Wayof example v'and not. limitation, the. invention is applicable :to a brake .'.offnthe disci type viwhichy includes ,an @annularzhousing rotatable witha vehicle` road Wheel and Asubstantially:channekshapedf inradial cross-section. Two :braking members engage v:internal {.wall lsurfacesof the housingito effectithe braking actiomand are actuated by .'camming :means therebetween, generally ,including .balls `-Vacting-zon .camming'rams of thebraking members. In 1removing Idust :and'iparticles eroded from 'the -friction surfaces-.and whichwould otherwise :clogthe: balls `and camming .ramps,.-.ihe invention.provides a scraper or :duster :for y yan internal tsurfacefof the .housing to L which centrifugal -:force, videvelopedby t rotation of the housing, :.-iwouldrdirectaeroded gdustrand particles; and; .todprovide a scraper or .zduster :which :is v'restrained against rotation with the housing by thefbraking members andswhich is so contouredas :to ,directihefrsrappage.touitable outlets in 'theQhQusing leading:fromtheVV surface scraped or dusted. i y

Othernebiectsand, ad.VertragesAv Of-:the invention-Will be pcmore apparent ,frcmthe embodmentin the-teecmpanying drawings, in which:

Fig. 1 is an elevational view, mainly in section, of a brake embodying the invention;

Fig. 2 is an enlarged fragmentary view taken approximately on the line 2 2 of Figgl, parts being broken away to show the underlying structure; y

Fig. 3 is a side elevational'view of the duster or scraper shown in Figs. l and 2;

Fig. 4 is a view similar to Fig. 3 but showing a modified duster or scraper.

Referring to the drawings, the inventionV is lilustrated and described in a vehicle road wheell of the steerable type but it is also similarly applicable to a driving wheel. The wheel is mounted on a spindle 5 movable to effect steering and includes a hub 6 journalled on the spindle, a

2,778,453 "Patented Jan. v22, 1957 2 disc 7 and a rims secured ythereto and on which atire 9 ,is mounted. An annular brake :housing .10 has an inwardly extendingrange jll and this flange and the disc ".7 :are bolted Das at 12 ,to the rhub ,6. The housing `10 ,includes two `segments ',113 and 14 each gprovided .with .-an internal, annular friction face 15 .axially opposite such face of the other, the segments .beingbolted togetheras at M The housing'hasv an lannular.internal surface 217 `which,extendsaxially"between the .friction faces 15 -and has a radius of curvatureaxially. Eachgsegment I1-3, L14 is provided lwith -a plurality of circumferentiallyispaced outlet openings, one' of which is 'shown 1 at y18, which ,lead .radially outwardlyfrom Athe surface Y1,7 :at: a location immediately adjacentV the friction :15.of a respectiveseg- A ypar ,of Aring-like brake members '119, commonly re- ,-ferredito as discs, arevpositioned in the-housing Lltlxfor -vengagement with ,arespective friction face .15,` and Aeach y,member hasa,friction lining 18, i,preferably in segments `bonded thereto, for contact ywith the cooperating friction face. `A plurality of circumferentallyspaced vballs :are ,disposed between the .members :.19a'nd-are respectively ,reeeiyedin .registering recesses orpockets in such .mem-

bers, a typical ball Zit vbeing :shownin the recesses .or

- `pocketsgl in eachmember f19. A camming .ramp extends circumferentiallyfrom,each recess, a typical ramp Mbeing shown `at 22. VSprings, onejshovvnat 2 3,bias.the Vmemhersfl9 together .against the balls 20;butwill.yield to Aa,Ceorrnnodate relative movement between-members The inboardfmember 119, as `vieu/,ed inn-Fig.l il, ispiloted on a pair of diametrically arranged[wheel cylinders, .one of which is shown at 24 and for such piloting each cyl- `inder-Zd has apagd ,as` shown `at 25. flheother. or outboard member 19. is. supported by y theqba-ll and recessar- ,rangementandV the biasing `of `sprngsf23. iEach cylinder is boltedas at 2to adlange x27 .ofthe-knuckle supportf28 and a cover platefl29-for the inboardside -of the .housing itl-is alsosecuredin place -by the-bolting ,at 2.6. For a driving, nonfsteerable roadwheel, ythe flange 2-7.is,provided bythe axle housing.

Fluid under.pressure, from anysuitable source,=is vadmitted to each'cylinderd between taxia'llyspaced pistons therein, one Vsuch -pistonbeing Ashovvnat :30,10 axially oppositely move the pistons andthe pistons respectively A.act*.onzthe-:braking membersdl Ato-rotate one in one direction `and the, ,otherin a seconddirection. ,As la result of this relative rotation of; members -19 the ,balls 20` ride ;.on theassociatedr rampsyZZ to spread-the membersklaxially into; braking engagement with a. respective friction face ,of-the housingglll. :Dust andparticlesware: erodedffrom the -'etiorially engaged faces Aof the `lining1118 andnhousing,,surfacesrland this eroded, rmatter ,causes ,erratic and ,non-uniform. operation of athebrake. `gThe centrifugal forceinduced -by rotation ofthe housingrfll() directs-.eroded dustand fparticle's,;as 1well,,asnothenforeign matter .which .mayrgainl access :to @tirez-housing,.outwardly .pto rthersurface 17 where it Will tend vto collect, particularly in the presence of a relatively moist atmosphere. A severe shock to the housing will loosen the collected material from surface 17 and some part'thereof will enter the space between members 19 and clog the balls 20 and ramps 22. When so clogged the normal action of the balls and ramps is hindered to an extent to cause erratic brake operation. yThe foregoing is one instance of the adverse results produced by dust and particles, it being understood that other specific interferences result including the heatl o scraper is preferably a at circular plate or disk and is formed from a stock of friction material commonly used for brake linings. The at plate makes for economical manufacture and the material selected should have good Wearing characteristics and should be non-metallic to prevent objectionable noise incident to contact with the metallic discs 19 and housing l0. Each disc 19 has a recess in the outer periphery thereof axially registering the recess of the other disc, a typical recess being shown at 32. Each such recess has a circumferential dimension suiciently greater than the diameter of disk di. to accommodate the requisite relative rotation of the braking disc 19 to the maximum extent during the life of the friction lining of the discs 19.

The circular contour of the duster or scraper 31 directs scrappage from the surface 17 axially outwardly to each series of openings 18 for the discharge therethrough to the exterior of the housing l0. The scraper 31 in eiect floats in the recesses 32 and regardless of its bodily rotative position, for example, always presents a circular scraping surface to the housing surface E7. The lower peripheral surface, as viewed in Fig. 2, of the disk 31 will undergo Wear through contact with the housing and as a result this surface will present a bevel contour such that'after wear the disk 31 will be generally similar in contour to the disk 31 of Fig. 4. It will be understood that if desired the disk 3l can be formed originally to the contour illustrated in Fig. 4.

In operation of the brake the housing rotates with the vehicle road wheel and the scraper 31, 31' is rotatably kstationary except for the movement permitted by the relatively larger recesses 32. Thus, the housing 10 in effect rotates relative to the scraper and the surface 17 of the housing is kept relatively free from collection of foreign matter, the scrappage being directed to the outlet openings 18 for discharge from the housing.

I claim:

l. A brake mechanism comprising an annular rotatable housing having axially spaced walls and an interconnecting wall, braking members positioned between said spaced walls and relatively movable to respectively engage the internal surfaces of said walls thereby to brake said housing, and a rigid scraper for the internal surface of said interconnecting wall supported by said housing on the last mentioned surface and restrained against rotation with the housing by at least one of said braking members, said housing having a discharge opening.

2. A brake mechanism comprising an annular rotatable housing having axially spaced walls and an interconnecting wall, braking members positioned between said spaced walls and relatively movable to respectively engage the internal surfaces of said walls thereby to brake said housing, each braking member having a recess registering with the recess of the other member, and a scraper for the internal surface of said interconnecting wall floating in said recesses and restrained therein against rotation with the housing, said housing having a discharge opening.

3. A brake mechanism comprising an annular rotatable housing having axially spaced Walls and an interconnecting wall, braking members positioned between said spaced walls and relatively movable to respectively engage the internal surfaces of said opposed walls thereby to brake said housing, each of said members having a periphery adjacent the internal surface of said connecting wall and a recess in its said periphery, and a rigid scraper for the last mentioned internal surface supported by the housing on said last mentioned surface and extending into said recesses for restraint therein against rotation with said housing, said interconnecting wall having a discharge opening.

4. A brake mechanism comprising an annular rotatable housing having axially spaced walls and an interconnecting wall, braking members positioned between said spaced walls and relatively movable to respectively engage the internal surfaces of said opposed walls thereby to brake said housing, each of said members having a periphery adjacent the internal surface of said connecting Wall and a recess in its said periphery, and a rigid scraper for the last mentioned internal surface supported by the housing on said last mentioned surface and extending into said recesses for restraint therein against rotatlon with said housing, said interconnecting Wall having openings therein respectively leading from the axially opposite extremities of the internal surface thereof for accommodating discharge of scrappage from the housing.

5. A brake mechanism comprising an annular rotatable housing having axially spaced walls and an interconnecting wall, braking members positioned between said spaced walls and relatively movable to respectively engage the internal surfaces of said opposed walls thereby to brake said housing, each of said members having a periphery adjacent the internal surface of said connecting wall and a recess in its said periphery, and a rigid scraper for the last mentioned internal surface supported by said housing on said last mentioned surface and extending into said recesses with clearance therein accommodating said relative movement of said braking members, the walls of said recess cooperating with said scraper to limit rotation of the scraper with .the housing, said housing having a discharge opening therein.

6. A brake mechanism comprising an annular rotatable housing having axially spaced walls, braking members between said spaced walls and relatively movable to respectively frictionally engage the internal surfaces of said walls thereby to brake said housing, said housing including an internal surface` radially'outwardly from the fric- 'tionally engaged surfaces of said Walls and said braking members and to which particles eroded by said frictional engagement are propelled by centrifugal force induced by rotation of said housing, said housing having openings therein respectively leading from the axially opposite extremities of said radially outward internal surface, and a rigid scraper for the last mentioned surface supported thereon and restrained against rotation with said housing by at least one of said braking members, said scraper having a periphery contoured to direct scrappage from such surface to said openings.

Clark Feb. 7, 1950 Lambert et al May 6, 1952 

